[SVC40-P01] Development of a GIS tool for viewing volcanic and tectonic data in Japan
Seismic data are mapped on the base layers with round marks. The diameter of the mark shows magnitude. The color of the mark represents the depth of epicenter. By clicking the mark, the user can get the minute information about the earthquake occurred at the location appeared as the text on the screen.
InSAR analysis data (image) is overlaid on the map. The transparency of the image can be adjusted for super-positioning or comparison of plural images. The user can get pixel values from the overlaid InSAR image. The value shows crustal deformation by cm in the satellite LOS direction. In addition, if the user clicks two points in a single image, the difference between the values of the two pixels, that is relative displacement, is calculated and displayed on the screen.
Crustal deformation data by GNSS observation is plotted in graphs. The user can see the time-series of displacement at the ground stations in the three directions (east-west, north-south and up-down) where the range of axes dynamically changes in response to the mouse cursor movement by the user. The optional function of drawing error bars is also implemented.
In future, we plan to install more kinds of data for better evaluation and estimation of volcanic activity. When a lot of data are installed, building of database is inevitable for simple management of them. Migration of this system to web-GIS is our next step where anyone can use the tool anytime and anywhere through the internet.